前端搜索條件參數可以直接用對應實體類封裝，但要注意實體類在定義字段的時候不要去用int 要用Interger
不然從前端搜索條件為空時，value為“ ”，即空的字符串，會報Field error in object ‘xxx’ on field ‘XXX’: rejected value []
因為傳值時無法轉換為int，會導致加載controller之前就報錯，故應把屬性值得類型改為Integer，即可接收到null
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